Show that the function is a solution of the wave equation.w(x, t) = cos (3t - 3cx), c ? 1
A. No
B. Yes
Answer: A
Mathematics
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Find the slope of the polar curve at the indicated point.r = 4 sin 4?, ? = 
A. 
B. undefined
C. 1 + 
D. -1
Mathematics
Solve the problem.Bengisu was pregnant 273 days and 264 days for her first two pregnancies. In order for Bengisu's average pregnancy to equal a national average of 267 days, how long must her third pregnancy last?
A. 268 days B. 242 days C. 264 days D. 269 days
Mathematics
Identify the complex number as real or imaginary.
A. Imaginary B. Real
Mathematics
Divide and simplify.
÷ 
A. - 
B. - 
C. - 
D. - 
Mathematics